Flux of organic carbon burial and carbon emission from a large reservoir: implications for the cleanliness assessment of hydropower

论文摘要

Accurately quantifying the budget of carbon sources and sinks in hydropower reservoirs is important for evaluating the cleanliness of hydroelectricity. However, current research on carbon emissions from reservoirs has rarely taken into account the organic carbon（OC） buried in sediment. Only greenhouse gas emissions from the water-air interface at reservoirs have been examined, which would result in an overestimation of the greenhouse effect of reservoirs. In November 2017, this study investigated the distribution of sediment in the Hongfeng Reservoir（HFR） in southwest China, a typical large hydropower reservoir, by using an underwater seismology monitoring system. We estimated the flux of OC into sediment using the results of a sediment survey and a dataset compiled from references. Our results show that, the HFR retained 200,715 t of OC in the sediment since its impounding after dam construction to the sampling year of 2017, when the average burial flux was 3,521 t-C aà1（106 g C aà1） and the modern burial flux was 5,449 t-C aà1. After excluding the exogenous OC, the modern valid carbon sink of the sediment was 4,632 t per year. Under the current state of the reservoir, taking the modern valid carbon sink value, the carbon emissions from the reservoir’s surface, and the discharge water from the dam into consideration, the net carbon sink of the HFR is found to be 1,098.9 t-C aà1. If the hydroelectricity generated by the reservoir is converted to a carbon sink, then the total net carbon sink becomes 12,972.9 t-C aà1.This work argues that both reservoir sediment and hydroelectricity are important carbon sinks and both should be included in assessments of the greenhouse effects of reservoirs.

论文目录

文章来源

类型: 期刊论文

作者: Fushun Wang,Yunchao Lang,Cong-Qiang Liu,Yong Qin,Ningxiao Yu,Baoli Wang

来源: Science Bulletin 2019年09期

年度: 2019

分类: 基础科学,工程科技Ⅰ辑

专业: 气象学,环境科学与资源利用

单位: School of Environmental and Chemical Engineering,Shanghai University,Institute of Surface-Earth System Sciences,Tianjin University

基金: supported by the National Key Research and Development Program of China (2016YFA0601003),the National Natural Science Foundation of China (41573064)

分类号: X16;X524

页码: 603-611

总页数: 9

文件大小: 1981K

下载量: 17

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